<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        /*样式重置 写样式之前，首先要进行样式重置*/
        *{margin: 0;padding: 0}
    </style>
</head>
<body>
    <div>div</div>
    <h1>h1</h1>
    <p>hello world</p>
    <ul>
        <li>html</li>
        <li>css</li>
    </ul>
</body>
</html>